Q's about modifying a Marauder Pistol

Just getting into pcp's (just bought a discovery) and I'm really enjoying myself. I'm already itching for another gun and I'm wondering if I can modify a Marauder pistol to do the following:
~19 ftlbs in .177
30+ shots
Quieter than my discovery (which is a lot louder than even my NPSS)

Would it be a simple as a regulator (even available for the marauder pistol?), hdd, deping, tune for a higher fill pressure, maybe a transfer port and hammer spring?

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